This example demonstrates how basic SVG shapes—circles and rectangles—can be styled and transformed using CSS. The graphic shows a progression from default black fills to explicit color fills, then a group with a custom light-blue fill and black stroke, and finally a connected polyline path. The code relies on native SVG elements like `<circle>`, `<rect>`, `<path>`, and the `<g>` container, while CSS classes such as `.lines` apply stroke properties and line joins. The inline `transform` attributes handle scaling and translation, and all shapes are embedded directly in the HTML without external data.